A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above
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A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light
A.flashing
B.pulsating
C.occulting
D.alternating
A.switching
B.alternating
C.oscillating
D.fluctuating
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port
A.should be passed close aboard on either side
B.indicates that special caution is required
C.is used at a channel bifurcation or junction
D.is painted with red and white vertical stripes
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A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A spherical buoy may be（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A white buoy with an orange rectangle on it displays（）.
An orange and white buoy with a rectangle on it displays（）.
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.